Classifications

• • C—CHEMISTRY; METALLURGY
  • C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
  • C11B—PRODUCING, e.g. BY PRESSING RAW MATERIALS OR BY EXTRACTION FROM WASTE MATERIALS, REFINING OR PRESERVING FATS, FATTY SUBSTANCES, e.g. LANOLIN, FATTY OILS OR WAXES; ESSENTIAL OILS; PERFUMES
  • C11B9/00—Essential oils; Perfumes
  • C11B9/0026—Essential oils; Perfumes compounds containing an alicyclic ring not condensed with another ring
  • C11B9/003—Essential oils; Perfumes compounds containing an alicyclic ring not condensed with another ring the ring containing less than six carbon atoms
• • C—CHEMISTRY; METALLURGY
  • C07—ORGANIC CHEMISTRY
  • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
  • C07C41/00—Preparation of ethers; Preparation of compounds having groups, groups or groups
  • C07C41/01—Preparation of ethers
• • C—CHEMISTRY; METALLURGY
  • C07—ORGANIC CHEMISTRY
  • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
  • C07C43/00—Ethers; Compounds having groups, groups or groups
  • C07C43/02—Ethers
  • C07C43/03—Ethers having all ether-oxygen atoms bound to acyclic carbon atoms
  • C07C43/14—Unsaturated ethers
  • C07C43/178—Unsaturated ethers containing hydroxy or O-metal groups
  • C07C43/1781—Unsaturated ethers containing hydroxy or O-metal groups containing rings other than six-membered aromatic rings
• • C—CHEMISTRY; METALLURGY
  • C07—ORGANIC CHEMISTRY
  • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
  • C07C47/00—Compounds having —CHO groups
  • C07C47/02—Saturated compounds having —CHO groups bound to acyclic carbon atoms or to hydrogen
  • C07C47/198—Saturated compounds having —CHO groups bound to acyclic carbon atoms or to hydrogen containing ether groups, groups, groups, or groups
• • C—CHEMISTRY; METALLURGY
  • C07—ORGANIC CHEMISTRY
  • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
  • C07C47/00—Compounds having —CHO groups
  • C07C47/20—Unsaturated compounds having —CHO groups bound to acyclic carbon atoms
  • C07C47/277—Unsaturated compounds having —CHO groups bound to acyclic carbon atoms containing ether groups, groups, groups, or groups
• • C—CHEMISTRY; METALLURGY
  • C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
  • C11B—PRODUCING, e.g. BY PRESSING RAW MATERIALS OR BY EXTRACTION FROM WASTE MATERIALS, REFINING OR PRESERVING FATS, FATTY SUBSTANCES, e.g. LANOLIN, FATTY OILS OR WAXES; ESSENTIAL OILS; PERFUMES
  • C11B9/00—Essential oils; Perfumes
  • C11B9/0042—Essential oils; Perfumes compounds containing condensed hydrocarbon rings
  • C11B9/0046—Essential oils; Perfumes compounds containing condensed hydrocarbon rings containing only two condensed rings
  • C11B9/0049—Essential oils; Perfumes compounds containing condensed hydrocarbon rings containing only two condensed rings the condensed rings sharing two common C atoms
• • C—CHEMISTRY; METALLURGY
  • C07—ORGANIC CHEMISTRY
  • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
  • C07C2601/00—Systems containing only non-condensed rings
  • C07C2601/06—Systems containing only non-condensed rings with a five-membered ring
  • C07C2601/08—Systems containing only non-condensed rings with a five-membered ring the ring being saturated
• • C—CHEMISTRY; METALLURGY
  • C07—ORGANIC CHEMISTRY
  • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
  • C07C2601/00—Systems containing only non-condensed rings
  • C07C2601/06—Systems containing only non-condensed rings with a five-membered ring
  • C07C2601/10—Systems containing only non-condensed rings with a five-membered ring the ring being unsaturated
• • C—CHEMISTRY; METALLURGY
  • C07—ORGANIC CHEMISTRY
  • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
  • C07C2602/00—Systems containing two condensed rings
  • C07C2602/02—Systems containing two condensed rings the rings having only two atoms in common
  • C07C2602/14—All rings being cycloaliphatic
  • C07C2602/18—All rings being cycloaliphatic the ring system containing six carbon atoms

Definitions

• the invention is in the field of fragrances and concerns fragrance compounds and composition with a natural sandalwood-like note, preparations containing these fragrances or fragrance mixtures, and the use of these new fragrance compounds and compositions to produce a sandalwood-like scent note.
• the present invention relates to novel fragrance compounds of general formula (I) which exhibit a sandalwood-like fragrance and which are derivable from campholenic aldehyde derivates according to general formula (II). Furthermore, the present invention discloses compositions comprising one or more of the inventive fragrance compounds. The invention also relates to the use of such compounds or fragrance compositions comprising one or more of the compounds according to the invention as an odorant or for improving the fixation of a fragrance compound or a fragrance composition. Furthermore, the present invention refers to the use of such compounds or compositions for the preparation of a perfumed products as well as perfumed products as such.
• Sandalwood is one of the oldest known and popular fragrance materials. It was originally produced in India, Ceylon and Indonesia.
• sandalwood oil a natural oil with a characteristic long lasting and powerful sweet and woody odor
• sandalwood oil is a stable fixative, making sandalwood oil even more popular in the perfume and cosmetics industry, so that there is generally a very high demand for new fragrances with comparable primary and secondary olfactory properties (such as tenacity, low odor threshold value, impact, i.e. odor intensity and substantivity).
• the oil extracted from Australian sandalwood tress contains remarkably lower amounts of santalol compared to the oil extracted from East Indian sandalwood trees, the constituent mainly responsible for the characteristic odor with woody and creamy nuances, and also contains additional constituents altering the characteristic sandalwood note, resulting in balsamic-woody notes and a rather dry- bitter, slightly resinous topnote compared to the essential oil obtained by steam distillation of East Indian sandalwood.
• Such synthetic fragrance compounds are for example: (i) 2-methyl-4-(2',2',3'- trimethyl-3'-cyclopenten-1'-yl)-butan-1-ol (Brahmanol®, Symrise AG), (ii) 2-ethyl-4- (2',2',3'-trimethyl-3'-cyclopenten-1'-yl)-2-buten-1-ol (Sandranol®, Symrise AG), (iii) 3- methyl-5-(2',2',3'-trimethyl-3'-cyclopenten-1 '-yl)-4-penten-2-ol (Ebanol®, Givaudan S.A.), (iv) 3,3-dimethyl-5-(2',2',3'-trimethyl-3'-cyclopenten-1 '-yl)-4-penten-2-ol (Polysantol®, Firmenich S.A.), (v) 3-methyl-5-(2,2,3-trimethylcyclopent
• EP 0829463 B2 discloses the preparation of the optically active compound (E)-(R)-2-alkyl-4-(2,2,3-trimethylcyclopent-3-en-1-yl)-2-buten-1-ol which has a fine sandalwood-like odor, and the use of this compound in perfume composition as well as in various cosmetics, fragrances, toiletries, and other hygienic goods.
• EP 0801049 A2 such as 3-Methyl-5-(1 ,2,2-trimethylbicyclo[3.1 0]hex-3-yl)pentan-2-ol or 2.3-Dimethyl-4-(1 ,2,2-trimethylbicyclo[3.1.0]hex-3-yl)butan-1-ol, wherein most of these compounds exert a sandalwood odor, but some are also just woody/amber like.
• US 4052341 A discloses a composition of 3-methyl-5-(2,2,3-trimethyl- cyclopent-3-en-1 -yl)pentan-2-ol and 6-(2,2,3-trimethylcyclopent-3-en-1 -yl)hexan-3-ol possesses a strong, precious woody odor pronounced of sandalwood oil.
• US 4610813 A refers to derivates of campholene aldehyde, such as (-)-(E)-
• WO 2008/052379 A2 refers to cyclopropanated 2,2,3-trimethylcyclopentane derivatives which possess a natural sandalwood oil odor.
• a-campholene aldehyde (2,2,3-trimethyl-3-cyclopenteneacetaldehyde, C10H16O) serves as starting material for these so-called “campholene sandalwood” aroma chemicals such as Brahmanol® (2-methyl-4-(2,2,3-trimethyl-3-cyclopenten-1- yl)butanol; Symrise AG).
• campholenic aldehyde fully achieves a natural sandalwood-like fragrance impression accompanied tenacities comparable to natural sandalwood oil.
• the object of the present invention is thus to provide new fragrance compounds having a natural woody sandalwood-like fragrance impression which are easily accessible and have a low odor threshold value and high inherent intensity accompanied by a long tenacity, excellent fixative properties, elevated impact and substantivity, therefore being equal or even superior to the sandalwood fragrance substances known from the prior art, while simultaneously being harmless to the environment.
• campholenic aldehyde derivatives according to the general formula (I) have a pronounced natural and intense sandalwood oil odor along with low odor threshold values and long tenacities, thus exhibiting excellent primary and secondary olfactory properties.
• the present invention relates to a compound of general formula (I):
• R represents an ether group, preferably a methoxy group (-OMe),
• R1 represents a hydrogen atom or an alkyl group, preferably R1 represents a hydrogen atom or a methyl group,
• the present invention relates to a compound according to general formula (II):
• the present invention relates to the use of a compound of general formula (II) for preparing the compounds of general formula (I) or their stereoisomers, in particular enantiomers.
• the present invention relates to a fragrance composition
• a fragrance composition comprising at least one compound according to the invention and at least one further fragrance substance.
• the present invention relates to the use of a compound or a fragrance composition comprising at least one compound according to the invention as an odorant or for improving the fixation of a fragrance compound or for the preparation of a perfumed product.
• the present invention relates to a perfumed product comprising a compound according to the present invention, or the fragrance composition comprising at least one compound according to the invention in an effective amount, and a carrier or substrate.
• R represents an ether group, preferably a methoxy group (-OMe),
• R1 represents a hydrogen atom or an alkyl group, preferably R1 represents a hydrogen atom or a methyl group,
• the compounds of formula (I) have an outstanding and unique odor profile which, among other things, has woody sandalwood-like notes.
• the compounds according to the invention convince by an extraordinarily good tenacity (long lasting) and a high substantivity.
• the chain marked as C1 to C4 in the general formula (I) is defined as a four- carbon chain, wherein said chain is preferably the n-butyl chain -X-CH2-CH2-CH2- which connects at the terminal carbon atom of the group X (i.e. the carbon atom marked as C4) to the cyclopentane ring and at the other terminal carbon atom of the chain (i.e. the carbon atom marked as C1) to an hydroxy group (-OH group).
• the tertiary C-atom is the C-atom indicated as C4 in the four-carbon chain marked as C1 to C4.
• the group X represents a CH2 group.
• the dotted lines are the most concise way of expressing these options in the above structural formula.
• the three dotted lines between the C-atoms marked as C2 and C3 in the general formula (I) may thus stand optionally for a double bond at these positions, or a cyclopropane ring encompassing these positions, or no extra function in the case of a non-cyclic single bond between the atoms C2 and C3. i.e. the dotted lines can be ignored, and we simply have a single bond, which forms a C-C bond between the C-atoms marked as C2 and C3. This meaning is also evident from the examples shown below and the experimental section.
• the chain marked as C1 to C4 is unsaturated and contains one double bond.
• These compounds exhibiting an unsaturated butyl chain achieve a more typical and natural sandalwood note with high intensities while showing outstanding tenacities.
• the groups R1 and/or R2 represent a hydrogen atom and/or an alkyl group independently from each other.
• the alkyl group is selected from the group consisting of a methyl group or a higher straight or branched alkyl chain such as for example an ethyl, propyl, n-butyl or iso-butyl group.
• R1 preferably represents a hydrogen atom or a methyl group and/or R2 preferably represents a hydrogen atom or a methyl group independently from each other, both of which were found to work well to achieve the desired sandalwood-like fragrance.
• R1 represents a methyl group, due to the resulting superior olfactory properties.
• the alkyl group of R1 and/or R2 is a methyl group, in order to achieve the most natural and strongest sandalwood-like, woody odor impression.
• R represents an ether group, such as methoxy, ethoxy, propoxy or a higher straight or branched ethoxy group.
• R preferably represents a methoxy group (-OMe), resulting in enhanced secondary properties such as intensity and tenacity.
• R2 should preferably represent a hydrogen atom, resulting in a more sandalwood-like odor profile.
• a further particularly preferred embodiment of the present invention concerns compounds of formula (I), wherein R2 represents a hydrogen atom.
• These variants are present independently of the characteristics of the butyl chain C1 to C4, which may have the above-defined structural attributes, respectively.
• the dotted lines are the most concise way of expressing these options in the above structural formula.
• the compound of general formula (I) exhibits a double bond which is preferably positioned between the C- atoms marked as C2 and C3 of the butyl chain C1 to C4.
• the cyclopentane ring is monocyclopropanated, as depicted by the dotted lines in formula (I).
• both positions indicated by dotted lines can represent a cyclopropane functionalization.
• R represents an ether group, preferably a methoxy group (-OMe)
• R1 represents a hydrogen atom or an alkyl group, preferably R1 represents a hydrogen atom or a methyl group
• R2 represents a hydrogen atom or an alkyl group, preferably R2 represents a hydrogen atom or a methyl group
• the chain marked as C1 to C4 is either saturated or is unsaturated and contains one double bond either between C2 and C3 or between C3 and C4
• the compounds of general formula (I) comprise at least one, preferably at least two, functional groups selected from the groups consisting of:
• the compounds of general formula (I) generally exhibit a chiral center at the position of the C-atom marked as CT of the cyclopentane ring and as such may exist as isomerically pure forms or in any mixture of the corresponding stereoisomers, in particular enantiomers. Consequently, whenever reference is made in the present description to a compound of formula (I), this is deemed to refer to all stereoisomers, in particular to all enantiomers, indifferently to the isomerically pure stereoisomers or mixtures of any of their stereoisomers. For economic reasons it is preferred to use the compounds as mixtures of their stereoisomers, in particular mixtures of their enantiomers.
• the compounds of general formula (I) are thus preferably present in the form of: (a) a pure optically active enantiomer;
• the present invention discloses a mixture of any of the above compounds and/or a mixture of any of the above stereoisomers as well as the use of such compounds and/or mixtures in the meaning of the present application.
• the term "compounds of formula (I)” means both, the individual compounds of formula (I) as well as all mixtures of the compounds of formula (I) in any mixing ratio. That is to say, statements in the following description concerning “compounds of formula (I)” apply both, to a single compound of formula (I) and to mixtures consisting of or comprising compounds of formula (I) in any mixing ratio.
• stereoisomers refers to all possible diastereomers or enantiomers of the compounds of general formula (I).
• the definition of the compounds of formula (I) also includes mixtures of stereoisomers, in particular also racemates or enantiomerically enriched mixtures, as well as their enantiomerically pure forms.
• the present invention relates to the compounds according to the invention as such individually or also mixtures of the compounds according to the invention.
• the olfactory impression imparted by the compounds of formula (I) is characterized by an outstanding naturalness and intensity, especially with regard to the sandalwood, woody note accompanied by high tenacities.
• the compound of the general formula (I) is selected from the group consisting of the following compounds and their stereoisomers, in particular also the enantiomers and mixtures thereof as specified in Table 1:
• Table 1 Preferred compounds according to general formula (I) and the present invention.
• the compounds according to the invention have an intense and long-lasting sandalwood-like, woody notes resembling of natural sandalwood essential oil, making only small amounts of the inventive compounds required in order to achieve a radiant, attractive and natural woody sandalwood note. Further, these compounds can be easily and economically prepared, therefore, being able to fully cover the perfume industry’s need for sandalwood fragrances.
• the new alcohols described by general formula (I) exhibit a strong, radiant, woody, sandalwood note, which strongly resembles the complex and characteristic odor profile of natural sandalwood while showing a high degree of tenacity.
• compounds 1 to 8 exhibit olfactory properties which can be assigned to the sandalwood, woody family of odors as indicated in the experimental section. Surprisingly, it has been found that the compounds of formula (I) and in particular compounds 1 to 8, impart an olfactory impression which is very close to the complexity of the natural woody odor profile of sandalwood. [0077] Surprisingly, it was found that in particular the compounds of formula (I), and in particular compounds 1 to 8, are suitable as sandalwood-like fragrances. These compounds show additionally superior secondary properties, such as an elevated tenacity, a low odor threshold value, elevated impact (odor intensity), as well as an elevated substantivity.
• the odor detection threshold (in the following abbreviated as “ODT”) is defined as the lowest concentration of a certain odorous compound (gaseous, sensorially active substance) which is perceivable and thus which can be distinguished with certainty from a blank reference under standard conditions.
• ODT the odor detection threshold
• concentration, solubility, partition coefficient between air and the olfactory active substance, vapor pressure, polarity, molecular mass etc. predictions referring to the ODT of a substance are difficult to make.
• Table 2 indicates the ODT values of preferred embodiment in comparison to commercially available Brahmanol® (Symrise AG) and Sandranol® (Symrise AG).
• the ODT was measured using an olfactometer T08 and a panel of at least four experts according to DIN standard EN 13725.
• the odor threshold value is defined as the concentration of an odorous substance at which, under defined test conditions, the probability of perceiving the sample is 0.5, i.e. 50% of the test persons indicate an odor perception.
• the quantitative ODT value is given as the ratio of volume fractions of an odor-free comparison matrix, such as air, to the examined matrix at which the odor could just be perceived, i.e. a dilution factor.
• Table 2 Comparison of the ODT values of compounds 1 to 4 according to formula (I) and commercially available Brahmanol® and Sandranol® (Symrise AG).
• Tenacity (the so-called lasting effect), a secondary but indeed important property of fragrance compounds, which is also known as adsorptive capacity, describes a compound's ability to adhere to a substrate. Therefore, tenacity describes the ability of a perfume to last, or a fragrance note to retain its characteristic odor. Tenacity thus typically refers to the long-term effectiveness of the fragrance in a perfumed product such as when applied on the skin after use e.g. of a shower gel/toilet soap/ deodorant. Generally, it is preferred that fragrance compound exhibit a long odor tenacity, i.e. that the odor of the corresponding fragrance compound last as long as possible without losing its odor characteristics.
• Substantivity describes the ability of a substance to be adsorbed from a usually aqueous phase onto a substrate or also its ability to remain on a substrate after a washing or rinsing operation. This effect is in particular manifested on substrates such as skin, hair and textile fibers (for example cotton, linen, wool and/or synthetic fibers).
• Tenacity is measured over a defined period of time and refers to samples adhered to a blotting-paper substrate in a defined amount, concentration, temperature and humidity and which are tested by a single member or a panel of experts. The tenacity refers to the time until which the odor can no longer be detected. Initially, for the first day the tenacity is measured hourly, thereafter in days.
• compounds 1 to 4 are preferred due to their property to exhibit the most natural, the strongest and the most persistent sandalwood odor based on their high threshold intensity and superior tenacity, being superior to any existing synthetic, commercially available materials exhibiting a sandalwood odor, such as Brahmanol® (Symrise AG).
• compound 3 (2-ethyl-4-[3-(methoxymethyl)-2,2-dimethyl-cyclopent-3- en-1-yl]but-2-en-1-ol) is particularly preferred, showing the best olfactoric properties of the above indicated compounds as demonstrated in Tables 2 and 3.
• compound 3 In comparison to the commercially available sandalwood fragrance substance Brahmanol® (Symrise AG), compound 3 exhibits a substantially lower threshold value, which is reduced by the factor of about 10, and thus shows a higher inherent intensity. Hence, lower amounts of the compound are necessary to result in an intense, radiant, natural woody sandalwood note and lower amounts are required for perfuming.
• Compound 2 and commercially available Brahmanol® can be derived from general formula (I):
• R1 and R2 are hydrogen atoms and the chain marked as C1 to C4 is saturated, i.e. exhibiting a noncyclic C-C single bond at the position of the dotted lines in the chain between the C-atoms marked as C2 and C3 of the butyl chain (no extra function of the dotted lines).
• R is hydrogen in Brahmanol® (Symrise AG)
• R stands for an ether group, in particular a methoxy group, in compound 2.
• compound 3 and commercially available Sandranol®, Symrise AG) both can be derived from general formula (I):
• R is hydrogen in Sandranol® (Symrise AG)
• R stands for an ether group, in particular a methoxy group, in compound 3.
• fragrance compounds and compositions thereof which give quite characteristic and harmonious odors and which retain their pleasing and characteristic odors over a considerable period of time without changing remarkably.
• compound according to formula (I) are even more effective than the botanical sandalwood oil as fixative.
• the dotted lines are the most concise way of expressing these options in the above structural formula.
• R represents an ether group, such as methoxy, ethoxy, propoxy or a higher straight or branched ethoxy group, independently from the structural configuration of the ring structure.
• R represents a methoxy group. Therefore, R preferably represents a methoxy group (-OMe).
• the compounds of general formula (II) do not comprise the compound 2-[3-(methoxymethyl)-2,2-dimethyl-cyclopent-3-en-1- yl]acetaldehyde or its stereoisomers:
• this compound has not been described regarding its olfactory properties yet.
• the above compound exhibits aldehydic, milky, almondy and pistachio notes. Therefore, this compound can be similarly used for perfuming purposes and as fragrance compound or in fragrance compositions.
• the sensory properties of this compound, and in particular its suitability as a fragrance with a special note, were not known until now. The use of that compound as a fragrance is therefore also subject of the present invention.
• campholenic aldehyde can occur in an optically active form or in any mixture of its stereoisomers as a function of the particular isomerism of the alpha-pinene used as the starting material for preparing it. This implies that the compounds derived from campholenic aldehyde can also occur in different stereoisomeric forms.
• the compounds of general formula (II) preferably exhibit either a C-C single bond between the C- atoms marked as C3’ and C4’ or a cyclopropane ring encompassing these C-atoms C3’ and C4’. It was found that these compounds exhibit extraordinary olfactory properties.
• the compounds of general formula (II) or formula (III) generally exhibit a chiral center at the position of the C-atom marked as CT of the cyclopentane ring and as such may exist as isomerically pure forms or in any mixture of the corresponding stereoisomers, in particular enantiomers. Consequently, whenever reference is made in the present description to a compound of formula (II) or formula (III), this is deemed to refer to all stereoisomers, in particular to all enantiomers, indifferently to the isomerically pure stereoisomers or mixtures of any of their stereoisomers. For economic reasons it is preferred to use the compounds as mixtures of their stereoisomers, in particular mixtures of their enantiomers.
• the compound of the general formula (II) is selected from the group consisting of the following compounds and their stereoisomers, in particular also the enantiomers and mixtures thereof as specified in Table 4:
• Table 4 Preferred compounds according to general formula (II) or general formula (III) and the present invention.
• campholenic aldehyde serve as starting materials for the production of the inventive compounds according to general formula (I) and as shown in the experimental section of the present invention.
• the present invention also relates to the use of a compound of general formula (II) or formula (III), as defined above, for preparing the compounds of general formula (I) or their stereoisomers, in particular enantiomers.
• the compounds of general formula (I) and formula (II) or (III) according to the invention can either be used as individual substances or in mixtures with at least one other known fragrance substance selected from an extensive range of natural and synthetic substances available in a large number of fragrance mixtures and/or in admixture with one or more ingredients or excipients conventionally used in conjunction with odorants in fragrance compositions, for example carrier materials and other auxiliary agents commonly used in the art.
• the present invention further relates to a fragrance composition, comprising at least one compound according to the present invention and thus formula (I) and/or (II) or (III) and at least one further fragrance substance.
• the fragrance substances specified in the following can be preferably used, either as individual substances or in mixtures with at least one, two, three or even more fragrance substances, in a large number of various fragrance mixtures and combinations, selected from an extensive range of natural and synthetic substances.
• fragrance substances which are advantageously suitable for combining with the inventive compounds and mixtures thereof: extracts of natural raw materials such as essential oils, concretes, absolutes, resins, resinoids, balsams, tinctures such as for example: ambergris tincture; amyris oil; angelica seed oil; angelica root oil; anise oil; valerian oil; basil oil; tree moss absolute; bay oil; artemisia oil; benzoin resin; bergamot oil; beeswax absolute; birch tar oil; bitter almond oil; savory oil; buchu leaf oil; cabreuva oil; cade oil; calamus oil; camphor oil; cananga oil; cardamom oil; cascarilla oil; cassia oil; cassie absolute; castoreum absolute cedar leaf oil; cedarwood oil; cistus oil; citronella oil; lemon oil; copaiba balsam; copaiba balsam oil; coriander oil; costus root oil
• a fragrance substance composition according to the invention comprises an amount of a compound according to the invention, preferably selected from compounds of general formula (I), which is olfactorily perceptible as a sandalwood odor note.
• a compound according to the invention preferably selected from compounds of general formula (I), which is olfactorily perceptible as a sandalwood odor note.
• a fragrance substance composition according to the invention based on the high olfactory intensity of the inventive compounds (primary property) in combination with the high tenacity (secondary property), generally, only low amounts of the inventive compounds are required to achieve the desired odor impression accompanied by enhanced environmental sustainability.
• the amount of the compound according to the invention used is preferably around 0.0001 to 90 % by weight, preferably 0.01 to 70 % by weight and particularly preferably 0.1 to 50 % by weight, relative to the total amount of the fragrance composition.
• Fragrance compositions which contain the at least one compound according to the invention may be used for perfuming applications in liquid form, undiluted or diluted with a solvent.
• Solvents suitable for this purpose are for example ethanol, isopropanol, diethylene glycol monoethyl ether, glycerol, propylene glycol, 1,2- butylene glycol, dipropylene glycol, diethyl phthalate, triethyl citrate, isopropyl myristate, triacetin, vegetable oils, etc.
• fragrance compositions which contain one or more compounds according to the invention may be adsorbed on a carrier which ensures both a fine distribution of the fragrance substances in the product and controlled release upon use.
• a carrier may be porous inorganic materials such as sodium sulphate, silica gels, zeolites, gypsums, clays, clay granules, aerated concrete etc., or organic materials such as woods, cellulose-based substances, sugars, dextrins (for example maltodextrin), or plastics such as PVC, polyvinyl acetates or polyurethanes.
• Fragrance compositions which contain at least one compound according to the invention indicated by formulas (I) and (II) or (III) may also be microencapsulated, spray-dried, be provided as inclusion complexes or as extrusion products (i.e. products according to the invention).
• the properties of the fragrance compositions modified in such a way may be further optimized with regard to a more targeted fragrance release by “coating” with suitable materials, for which purpose waxy plastics such as for example polyvinyl alcohol are preferably used.
• suitable materials for which purpose waxy plastics such as for example polyvinyl alcohol are preferably used.
• the resultant products are in turn products according to the invention.
• fragrance compositions according to the invention may be encapsulated, for example, by coacervation methods with the assistance of capsule materials made for example from polyurethane-type substances or soft gelatine.
• Spray-dried fragrance compositions may be produced for example by spray drying an emulsion or dispersion containing the fragrance substance composition, wherein modified starches, proteins, dextrin and vegetable gums may be used as carriers.
• Inclusion complexes may be produced for example by introducing dispersions of the fragrance substance composition and cyclodextrins or urea derivatives into a suitable solvent, for example water.
• Extrusion products may be produced by melting the fragrance substance compositions with a suitable waxy substance and extruding with subsequent solidification, optionally in a suitable solvent, for example isopropanol.
• the compounds according to formulas (I), (II) and (III), in particular formula (I), as well as compositions comprising one or more of these inventive compounds are suitable to achieve a pleasant odor impression, in particular a natural-like sandalwood fragrance impression with hight strength even if only used in small amounts. Furthermore, based in the present application it is possible to provide environmentally sustainable fragrance compounds which are able to satisfy the present as well as future need for fragrance compounds exhibiting (and even exceeding) the beneficial olfactory properties of natural, long lasting and radiant sandalwood oil.
• the compounds according to formula (I) and the invention accordingly have an organoleptically highly valuable intense and natural sandalwood note combined with a surprisingly elevated tenacity.
• the compounds exhibit a positive action over the entire fragrance chord by distinctly enhancing the natural-like sandal note of the composition and simultaneously providing excellent tenacity.
• the compound according to the invention and especially according to formula (I) may therefore in particular be used as a fixative in fragrance compositions and perfumed products.
• the present invention thus relates to the use of a compound according to general formula (I), (II) or (III) or a fragrance composition comprising at least one of these compounds as an odorant or for improving the fixation of a fragrance compound or for the preparation of a perfumed product.
• a compound according to general formula (I), (II) or (III) or a fragrance composition comprising at least one of these compounds as an odorant or for improving the fixation of a fragrance compound or for the preparation of a perfumed product.
• the compounds indicted above, exhibiting specific odor profiles as well as the mixtures thereof, and also the fragrance compositions according to the invention, as defined above, are particularly suitable for the preparation of perfumed products. Based on these compounds, mixtures and compositions it is possible to obtain perfumed products, in particular products emanating a woody, sandalwood-like odor impression. Due to the long tenacity in combination with the low threshold values only small amounts of the inventive compounds, in particular the compounds derived from general formula (I), are required to achieve an intense, radiant, attractive, natural woody sandalwood-like smell emanating from the perfumed products.
• these fragrance compounds and fragrance compositions can be used in order to convey a natural-like sandalwood odor in the resultant complete mixture, to enhance an existing sandalwood odor in the composition of the other constituents, and/or to modify an existing sandalwood odor in the composition of the other constituents.
• the compounds of formula (I) in general and in particular, compounds 1 to 4 are particularly excellent for imparting, modifying and/or enhancing a woody sandalwood-like fragrance being confusingly similar to the odor profile of natural sandalwood essential oil. The fact that the compounds have such an expressive scent and long tenacity is surprising.
• the combination of high intensity and tenacity allows for the use of said compounds and composition to achieve a pleasant odor in conjunction with an improved fixation of a fragrance compound resulting in an harmonic and long-lasting overall odor impression with the reminiscence of natural sandalwood, applicable for various perfumed products and for the production thereof.
• inventive compounds or fragrance compositions can be incorporated into products which are perfumed or are intended to be perfumed, in particular formulations serving for personal hygiene such as cleaning agents, laundry agents in order to achieve an intense and long-lasting sandalwood-like note, even if used in small amounts.
• the perfumed products according to the invention containing the inventive compounds or fragrance compositions can be obtained by incorporating the compound or composition according to the invention as solid substance without a solvent, as a solution or in the form of a mixture with a solid or liquid carrier and optionally other auxiliaries and/or stabilizers.
• the present invention therefore, further refers to perfumed products comprising a compound according formula (I), (II) and/or (III) or a fragrance composition comprising at least one of said compounds in an effective amount, and a carrier or substrate.
• inventive compounds are either used individually or as part of a mixture or fragrance composition according to the invention.
• a sensory effective amount means that already a proportion of the substances of formula (I), formula (II) and/or formula (III), in particular compounds according to general formula (I), in the mixture is sufficient to emanate a pleasant perceptible fragrance impression, especially a sandalwood-like woody odor impression.
• This perceivable olfactory impression is generally achieved when at least 0.001 wt.% of the compounds of formula (I), formula (II) or formula (III) are present.
• Perfumed products according to the invention are for example perfume extracts, eau de perfume, eau de toilette, shaving lotions, eau de colognes, pre-shave products, splash c perfumes and perfumed tissue wipes, including for perfuming acidic, alkaline and neutral cleaning agents such as for example floor cleaners, window cleaners, dishwashing detergents, bath and sanitary cleaners, scouring creams, solid and liquid toilet cleaners, pulverulent and foam carpet cleaners, textile fresheners, ironing aids, liquid detergents, pulverulent detergents, laundry pre-treatment agents such as bleaches, soaking agents and stain removers, laundry rinse conditioners, laundry soaps, laundry tablets, disinfectants, surface disinfectants as well as air fresheners in liquid or gel form or those applied to a solid carrier, aerosol sprays, waxes and polishes such as furniture polishes, floor waxes and shoe polishes as well as body care products such as for example solid and liquid soaps, shower gels, shampoos
• the products according to the invention may also be semi-finished products comprising a compound of general formula (I), (II) and/or (III) or a fragrance composition containing at least a compound according to the invention in an effective amount.
• the percentages at which the compound of general formula (I), (II) and/or (III) or a fragrance composition which contains at least a compound according to the invention is used may vary within wide limits, ranging from a few parts per thousand as even small amounts of the novel compounds or fragrance compositions comprising such compounds provide a rich sandalwood, woody and/or creamy impression.
• the compound of general formula (I), (II) and/or (III) or the fragrance composition which contains at least a compound according to the invention is used in an amount of 0.0001 to 90% by weight, preferably 0.01 to 70% by weight and particularly preferably 0.1 to 50 % by weight, based on the total weight of the final formulation.
• the perfumed product is preferably a perfume oil, perfume base, formulation for personal hygiene, cleaning agent or laundry agent.
• Compound A was prepared according to the method described in Helvetica Chimica Acta, 1998 (81 ), 1349-1358.
• GC-MS-Data 196, 181 , 149, 137, 120, 99, 79, 67, 45, 29.
• Compound B 2-[3-(Methoxymethyl)-2,2-dimethyl-cyclopentyl]acetalde- hyde
• Compound B was prepare by hydrogenating 2-[3-(methoxymethyl)-2,2- dimethyl-cyclopent-3-en-1-yl]acetaldehyde (30 g, 164.6 mmol) using 0.2 g of Pd/C (5%) under a pressure of 25 bar at 80 °C, resulting in a yield of 28.7 g for the raw material. Subsequent purification by bulb-to-bulb distillation at 104 °C and 1.4 mbar resulted in the pure compound B with a yield of 26.8 g (88%).
• Odor description herbal, sorrel, green.
• Compound C was prepared according to the method described in Helvetica Chimica Acta, 1992 (75) 1527.
• GC-MS-Data 182, 167, 150, 138, 123, 106, 91 , 79, 67, 53, 45.
• Odor description aldehydic, milky, almondy, pistachio, edible.
• Step 1 Preparation of 4-[3-(methoxymethyl)-2,2-dimethyl-cyclopent-3-en-1- yl]-2-methyl-but-2-enal (intermediate compound):
• Step 2 Preparation of 4-[3-(methoxymethyl)-2,2-dimethyl-cyclopent-3-en-1- yl]-2-methyl-but-2-en-1-ol (compound 1):
• reaction mixture was quenched with ice water, the as-obtained salt was reacted using 25% H2SO4 (25 ml_), and the resulting product extracted using MTBE (50 ml_ x3). Then the organic phase was washed with saturated NaHCCb solution (50 ml_).
• GC-MS-Data 224, 209, 192, 177, 159, 137, 123, 107, 93, 79, 67, 55, 43.
• Odor description sandal, woody.
• GC-MS-Data 226, 211 , 179, 161 , 139, 121 , 107, 84, 69, 55, 45, 29.
• GC-MS-Data 213, 196, 181 , 153, 112, 95, 81 , 69,55, 45, 29.
• GC-MS 238, 223, 206, 191, 175, 159, 137, 123, 107, 93, 79, 67, 57.
• This compound (compound 4) was prepared according to the method described in US 4610813 A.
• Step 1 Preparation of 2-[3-(methoxymethyl)-2,2-dimethyl-cyclopent-3-en-1-yl] prop-2-enal:
• GC-MS-Data 194, 179, 162, 147, 133, 119, 105, 91 , 77, 67, 53, 41 , 29.
• Step 2 Preparation of 2-[3-(methoxymethyl)-2,2-dimethyl-cyclopent-3-en-1-yl] prop-2-en-1-ol:
• the resulting salt was reacted with 25% H2SO4 (25 ml_), extracted using MTBE (20 ml_ x3), and the organic phase washed with saturated NaHCCb solution (50 ml_). Thereafter, the combined organic phases have been washed with water until a neutral pH was reached, dried with Na2S04, filtered and the solvent distilled under vacuum to obtain the raw product (18.2 g), which subsequently was purified using Kugelrohr/bulb-to- bulb distillation, in an amount of 17.5 g (81.4%) (purification in two steps).
• GC-MS-Data 196, 181 , 163, 131 , 105, 91 , 79, 67, 55, 41 , 29.
• Step 3 Preparation of ethyl-4-[3-(methoxymethyl)-2,2-dimethyl-cyclopent-3- en-1-yl]-2-methyl-pent-4-enoate:
• GC-MS-Data 280, 248, 203, 174, 147, 119, 105, 91 , 79, 41 , 29.
• Step 4 Preparation of 4-[3-(methoxymethyl)-2,2-dimethyl-cyclopent-3-en-1-yl]- 2-methyl-pent-4-en-1-ol, as isomeric mixture (2:1 ), (compound 4):
• reaction mixture was quenched with ice water, the generated salt was decomposed using 25% H2SO4 (5 ml_), the compound extracted using MTBE (20 ml_ x3), and the organic phase washed with saturated NaHCCb solution (50 ml_).
• GC-MS-data 238, 223, 206, 191 , 163, 147, 133, 119, 105, 91 , 80, 67, 55, 41.
• GC-MS-Data 208, 193, 176, 161, 140, 121, 109, 95, 81, 67, 55, 45, 29.
• Step 1 Preparation of ethyl-4-[1-(methoxymethyl)-2,2-dimethyl-3- bicyclo[3.1.0] hexanyl]-2-methyl-but-2-enoate:
• reaction mixture was quenched with cold water, the compound extracted using MTBE (100 ml_ x3), the organic phase washed with water (60 ml_ x4), dried with Na2S04, filtered and the solvent distilled under vacuum to obtain the raw product (5.7 g), which was used in the following step without further purification.
• GC-MS-Data 280, 265, 235, 219, 189, 161 , 121 , 99, 79, 67, 45, 29.
• Step 2 Preparation of 4-[1-(methoxymethyl)-2,2-dimethyl-3-bicyclo[3.1 .0] hexanyl]-2-methyl-but-2-enal:
• reaction mixture was quenched with ice water, the as-obtained compound extracted using MTBE (30 ml x3), the organic phase washed with water (30 ml x2), dried with Na2S04, filtered and the solvent distilled under vacuum to obtain the raw product (6.5 g), which was used in the following without further purification.
• GC-MS-Data 221, 191, 153, 99, 79, 67, 45, 29.
• Step 3 Preparation of 4-[1-(methoxymethyl)-2,2-dimethyl-3-bicyclo[3.1.0] hexanyl]-2-methyl-but-2-en-1-ol (compound 6):
• GC-MS-Data 238, 220, 193, 175, 147, 121 , 99, 79, 67, 55, 43.
• Step 1 Preparation of 2-ethyl-4-[1-(methoxymethyl)-2,2-dimethyl-3-bicyclo [3.1 0]hexanyl]but-2-enal:
• reaction mixture was quenched with ice water, the compound extracted using MTBE (30 ml x3), the organic phase washed with water (30 ml x2), dried with Na2S04, filtered and the solvent distilled under vacuum to obtain the raw product (6.4 g), which was used in the further synthesis without further purification.
• Step 2 Preparation of 2-ethyl-4-[1-(methoxymethyl)-2,2-dimethyl-3-bicyclo [3.1.0] hexanyl]but-2-en-1-ol (compound 7):
• reaction mixture was quenched with ice water, the obtained salt was decomposed using 25% H2SO4 (2 ml_), the resulting product extracted using MTBE (50 ml_ x3) and the organic phase washed with saturated NaHCCb solution (50 ml_).
• Step 1 Preparation of 2-[[1-(methoxymethyl)-2,2-dimethyl-3-bicyclo[3.1 .0] hexanyl]methyl]-1-methyl-cyclopropanecarbaldehyde:
• Step 2 Preparation of 1-[2-[[1-(methoxymethyl)-2,2-dimethyl-3-bicyclo[3.1 .0] hexanyl]methyl]-1-methyl-cyclopropyl]ethanol (compound 8):
• reaction mixture was quenched with ice water, the generated salt was decomposed using 25% H2SO4 (2 ml), the compound extracted using MTBE (50 ml_ x3), and the organic phase washed with saturated NaHCCb solution (50 ml).
• GC-MS-Data 266, 251 , 233, 203, 165, 147, 121 , 99, 79, 55, 43, 29.

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